Hirofumi Nogami, Ryo Inoue, Ryuta Shiraishi, Yuki Seki, and Renshi
Sawada, Stress monitoring of cows using an integrated optical photoplethysmographic sensor, BIO4APPS2017, 2018.12, Detecting the stress level of cows is one of the important purposes for a cow health monitoring system. This is because high stress causes not only lowered resistance to illnesses but also estrus failure. Both electrocardiographic monitors and photoplethysmographic (PPG) sensors can measure stress intensity. The electrocardiographic monitors, which can accurately measure the rate and rhythm of heartbeats, are useful to detect stress intensity. However, long-term usage is not suitable due to its operating with electrodes. On the other hand, PPG sensors can be attached to the cow’s tail for long term monitoring. Thus, we have developed wearable type PPG sensors and attempted to detect stress intensity..

2.

Hirofumi Nogami, Ryo Inoue, Yuma Hayashida, Hideyuki Ando, Takahiro Ueno, and Renshi
Sawada, Multifunctional optical sensor module Integrate1d optical micro displacement sensor and its application to a photoplethysmographic sensor with measuring contact force, BIOSTEC2018
, 2018.01, Photoplethysmography (PPG) is widely and commonly used, as it produces a wide range of information, such as stress level, heart rate interval, respiration rate, blood vessel hardness, etc. It is necessary to control the contact force between a PPG sensor and the measurement location (the skin surface), in order to obtain an accurate PPG signal. We propose new multifunctional sensor modules that can measure both pulse waves and contact force. The sensor module has a micro integrated displacement sensor chip with an optical source, photo diodes, and op-amp circuits, and a gum frame with a mirror. Some incident light penetrates into a finger, and the scattered light, which contains a biological signal (a pulse wave), is detected by one photodiode. The photodiode can also detect reflected light from a mirror, which is displaced by a contact force. In this paper, we fabricate a multifunctional sensor module and attempt to simultaneously measure the pulse wave and contact force. .

3.

野上大史、野崎太貴、澤田廉士, Wearable Devices for Healthcare, 1stSino-JapanSeminar on Micro/Nano Systems for Biomedical Applications, 2017.03, For the purpose of increased safety and security, wireless sensor network systems are being used increasingly in applications such as structural health monitoring, human health monitoring, agricultural field monitoring, and animal health monitoring [1–4]. Animal health monitoring system can achieve early detection and prevention of diseases and thus reduce economic losses. The wireless sensor nodes attached to animals, in conjunction with a wireless health-monitoring system, detect initial fever, abnormal activity, or stress level of the animals. In this study, we have focused on developing wireless pulse wave sensor to detect stress levels..

4.

野上大史、白石隆太、井ノ上涼、永友 康隆、澤田廉士, Stress monitoring of cow by using pulse wave, BIO4APPS2016, 2016.12, Stress monitoring of cow by using pulse wave.

5.

野上大史、白石隆太、井ノ上涼、澤田廉士, Laser Doppler blood flowmeter for animal health monitoring system, The 7th Japan-China-Korea Joint Conference on MEMS/NEMS2016, 2016.09, The estrus intensity detection of the cow is one of the important purposes for animal health monitoring system. During the time of estrus the engorged vagina can be observed from the outside. The engorged vagina is possible to cause blood flow change. To detect the estrus intensity, we have developed the laser Doppler blood flowmeter sensor element. The sensor element is 3.5 x 5.5 x 1.8mm, which is enable to fabricate wearable wireless sensor node. Using the sensor nodes, we could measure blood flow of the cow in short time. However, measurement of the blood flow was not stable in long term. The cause of the unstable measurement was that the blood flow was sensitive to the contact force between cow’s skin and sensor. The contact force easily changed depending on method of mounting or wagging cow’s tail. In this paper, we incorporated the laser Doppler blood flowmeter sensor element with the force sensor to simultaneously measure the blood flow and the contact force. As a result, we could observe stable measured value of the blood flow and pulse wave at the stable contact pressure. At the unstable contact pressure, the measured value of underwent a lot of changes. In addition, the pulse wave couldn’t be observed. Thus, we propose that the measurement of the blood flow need to correct for the influence of the contact force..

野上 大史, 岡田 宏尚, 宮本 亨, 前田 龍太郎, 伊藤 寿浩, Wearable wireless sensor nodes for an animal health monitoring system, IUMRS-ICA 2014, 2014.08, [URL], To achieve the goal of creating a safer and more secure society, wireless sensor network technology has been a promising approach for a variety of applications, such as structural health monitoring, human body monitoring and animal health monitoring. Animal health monitoring system can achieve early detection and prevention of diseases and thus reduce economic losses. The wireless sensor nodes attached to animals, in conjunction with a wireless health-monitoring system, detect initial fever or abnormal activity of the animals. In this study, we have focused on developing the toughness activity sensors for chickens and the flexible temperature sensors for calves..